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        <h3 class="post-title"><span>vue中的过滤器简单介绍</span></h3>
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    <p class="post-meta text-center">
        Calos 发表于
        <time datetime="2019-05-20T16:00:00.000Z">2019-05-21</time>
    </p>
    <div class="post-content">
        <p>​    你可以自定义过滤器，<strong>用作一些常见的文本格式化</strong>，过滤器可以用在两个地方：<strong>mustache 插值和 v-bind 表达式（双花括号插值和 v-bind 表达式 (后者从 2.1.0+ 开始支持)</strong>。过滤器应该添加在 JavaScript 表达式的尾部，由“管道”符号提示！</p>
<hr>
<h2 id="全局过滤器"><a href="#全局过滤器" class="headerlink" title="全局过滤器"></a>全局过滤器</h2><ul>
<li>定义的语法，是<code>filter</code>，<strong>此时不是复数形式</strong></li>
</ul>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">Vue.filter(<span class="string">'过滤器的名称'</span>，<span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;&#125;)</span><br></pre></td></tr></table></figure>
<ul>
<li>定义一个过滤器</li>
</ul>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//定义一个过滤器 msgFormat,传递两个参数，第一个是要处理的字符串，第二个是要替换的字符串</span></span><br><span class="line">Vue.filter(<span class="string">'msgFormat'</span>,<span class="function"><span class="keyword">function</span>(<span class="params">msg,arg</span>)</span>&#123;</span><br><span class="line"><span class="comment">//第一个参数可以写字符串，也可以写正则表达式</span></span><br><span class="line">	<span class="keyword">return</span> msg.replace(<span class="regexp">/单纯/g</span>,arg);</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>
<ul>
<li>一个过滤器可以调用多个过滤器，一个过滤器也可以传递多个参数</li>
</ul>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">&lt;!-- 调用过滤器的格式:&#123;&#123; name | 过滤器的名称 &#125;&#125; --&gt;</span></span><br><span class="line">&#123;&#123; msg | msgFormat('666') &#125;&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">&lt;!-- 在 `v-bind` 中 --&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">div</span> <span class="attr">v-bind:id</span>=<span class="string">"rawId | formatId"</span>&gt;</span><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br></pre></td></tr></table></figure>
<ul>
<li>全局过滤器，<strong>进行时间格式化</strong></li>
</ul>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line">Vue.filter(<span class="string">'dateFormat'</span>,<span class="function"><span class="keyword">function</span>(<span class="params">dateStr,pattern=<span class="string">""</span></span>)</span>&#123;</span><br><span class="line">    <span class="comment">//转化成时间</span></span><br><span class="line">    <span class="keyword">let</span> dt = <span class="keyword">new</span> <span class="built_in">Date</span>(dateStr);</span><br><span class="line"></span><br><span class="line">    <span class="comment">//yyyy-mm-dd</span></span><br><span class="line">    <span class="keyword">let</span> y = dt.getFullYear();</span><br><span class="line">    <span class="keyword">let</span> m = dt.getMonth()+<span class="number">1</span>;</span><br><span class="line">    <span class="keyword">let</span> d = dt.getDate();</span><br><span class="line"></span><br><span class="line">    <span class="keyword">if</span>(pattern.toLowerCase() === <span class="string">'yyyy-mm-dd'</span>)&#123;</span><br><span class="line"> 	   <span class="keyword">return</span> <span class="string">`<span class="subst">$&#123;y&#125;</span>-<span class="subst">$&#123;m&#125;</span>-<span class="subst">$&#123;d&#125;</span>`</span>;</span><br><span class="line">    &#125;<span class="keyword">else</span>&#123;</span><br><span class="line">        <span class="keyword">let</span> hh = dt.getHours();</span><br><span class="line">        <span class="keyword">let</span> mm = dt.getMinutes();</span><br><span class="line">        <span class="keyword">let</span> ss = dt.getSeconds();</span><br><span class="line">        <span class="keyword">return</span> <span class="string">`<span class="subst">$&#123;y&#125;</span>-<span class="subst">$&#123;m&#125;</span>-<span class="subst">$&#123;d&#125;</span> <span class="subst">$&#123;hh&#125;</span>:<span class="subst">$&#123;mm&#125;</span>:<span class="subst">$&#123;ss&#125;</span>`</span>;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>
<h2 id="私有过滤器"><a href="#私有过滤器" class="headerlink" title="私有过滤器"></a>私有过滤器</h2><p>定义私有过滤器有两个条件：名称和处理函数。<font color="#90EE90"><strong>过滤器调用的时候，采用的是就近原则，如果私有过滤器和全局过滤器名称一致了，这时候优先调用私有过滤器。</strong></font><strong>注意一点，定义私有过滤器的时候，<code>filters</code>是复数形式</strong></p>
<p>示例代码如下：</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> vm = <span class="keyword">new</span> Vue(&#123;</span><br><span class="line">    el: <span class="string">'#app'</span>,</span><br><span class="line">    data: &#123;</span><br><span class="line">        dt: <span class="keyword">new</span> <span class="built_in">Date</span>()</span><br><span class="line">    &#125;,</span><br><span class="line">    methods: &#123;&#125;,</span><br><span class="line">    filters: &#123; <span class="comment">//定义私有过滤器,名称和处理函数</span></span><br><span class="line">        dateFormat: <span class="function"><span class="keyword">function</span>(<span class="params">dateStr, pattern = <span class="string">""</span></span>) </span>&#123;</span><br><span class="line">            <span class="comment">//转化成时间</span></span><br><span class="line">            <span class="keyword">let</span> dt = <span class="keyword">new</span> <span class="built_in">Date</span>(dateStr);</span><br><span class="line"></span><br><span class="line">            <span class="comment">//yyyy-mm-dd</span></span><br><span class="line">            <span class="keyword">let</span> y = dt.getFullYear();</span><br><span class="line">            <span class="keyword">let</span> m = dt.getMonth() + <span class="number">1</span>;</span><br><span class="line">            <span class="keyword">let</span> d = dt.getDate();</span><br><span class="line"></span><br><span class="line">            <span class="keyword">if</span> (pattern.toLowerCase() === <span class="string">'yyyy-mm-dd'</span>) &#123;</span><br><span class="line">                <span class="keyword">return</span> <span class="string">`<span class="subst">$&#123;y&#125;</span>-<span class="subst">$&#123;m&#125;</span>-<span class="subst">$&#123;d&#125;</span>`</span>;</span><br><span class="line">            &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">                <span class="keyword">let</span> hh = dt.getHours();</span><br><span class="line">                <span class="keyword">let</span> mm = dt.getMinutes();</span><br><span class="line">                <span class="keyword">let</span> ss = dt.getSeconds();</span><br><span class="line">                <span class="keyword">return</span> <span class="string">`<span class="subst">$&#123;y&#125;</span>-<span class="subst">$&#123;m&#125;</span>-<span class="subst">$&#123;d&#125;</span> <span class="subst">$&#123;hh&#125;</span>:<span class="subst">$&#123;mm&#125;</span>:<span class="subst">$&#123;ss&#125;</span>`</span>;</span><br><span class="line">            &#125;</span><br><span class="line"></span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>
<blockquote>
<font color="#9A32CD"> <em>使用ES6中的字符串新方法 String.prototype.padStart(maxLength,fillString=’ ‘) 或者 String.prototype.padEnd(maxLength, fillString=’ ‘）来填充字符串</em></font>
</blockquote>
<p>示例：</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//字符串总长度为2，不满足时在前面补 0</span></span><br><span class="line"><span class="keyword">let</span> hh = dt.getHours().toString().padStart(<span class="number">2</span>,<span class="string">'0'</span>);</span><br><span class="line"><span class="keyword">let</span> mm = dt.getMinutes().toString().padStart(<span class="number">2</span>,<span class="string">'0'</span>);</span><br><span class="line"><span class="keyword">let</span> ss = dt.getSeconds().toString().padStart(<span class="number">2</span>,<span class="string">'0'</span>);</span><br></pre></td></tr></table></figure>

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